SocksAddict.com
Details: 10% Off, not sure when it expires but it just worked for me
Sock Company
Details: 20% Off SmartWool Socks Sale Items.
compressionsale.com
Details: Get Up to 62% Off McDavid Supports + Free Domestic Shipping on All Orders
happysocks.com
Details: Always free shipping with orders of four pairs or more at www.happysocks.com
LittleMissMatched
Details: Check out the sale items at LittleMissMatched! Up to 70% off!
Injinji Store
Details: Get 25% Off Podium Special Valid on RUN Series Lightweight Mini-Crew in Black & TRAIL Series Midweight Micro in Granite. Ends 08/31/2013.
Smartwool
Details: Free Shipping on Orders $100+
Thorlos
Details: Buy 3 Get 1 Free on Your Hiking Socks Purchase
GoldToe
Details: Free Shipping on Order of $50+. Expires 6/17/2012.
Joy Of Socks
Details: Free first class shipping right now on the website. No expiration date listed.
Tons Of Socks
Details: 10% OFF
socks4life
Details: 10% Off Entire Order
Sock It To Me
Details: $.50 off every pair of socks when you purchase 3 or more.
Renfro Socks
Details: Save on all socks with code. Expires 9/3/2013
Toesox
Details: Free Shipping on Orders Over $45
Absolute Socks
Details: Back to School Sale - 10% Off orders of $50 or more (No coupon code needed). Ends 8/31/2013
The Sock Company
Details: 30% Off Socks Sale
Jox Sox
Details: Free pair with order.
Sock Geek
Details: Get Free shipping on All USA & Canadian orders over $54.95
Wilson Sport Socks
Details: Free shipping on $40 or more. Exp. unknown
RunningSocks.com
Details: 10% off any running sock